A customer who has a chain and several stores in Los Angeles contacted me while ago. They are in cosmetics and beauty business. They have 1-2 hand tufted rugs with very light blue and open field background in each store which get dirty very easily. They wanted us to dye one of the rugs to blue iris as a sample before they would give us all the rug for dyeing. We did this. It was difficult because the rug was cleaned before we picked it up. Some chemicals were used to remove the stains and this made our dyeing very difficult and time consuming. The treated spots reacted differently to our dye and we had to remove the dye and let it dry before we can dye the spot again. I am enclosing few photos of the process.